[DRBD-user] 2.6.24-rc1 oops

Matteo matteo at rmnet.it
Wed Nov 7 14:46:41 CET 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Hi Lars and thank for your quick answer, i had a little look at the kernel
Changelog and i saw they changed sg_set_page, suggestin use of
sg_assign_page.I went to drbd/drbd_worker.c changin sg_set_page to sg_assign_page and it
compiles without problems. So i solved the oops usin the rc2...

BUT, even switching to new kernel my problems remains the same...
I have tested latest drbd/kernel with CORE2/QUAD processors and i'm in deep
troubles, syncer get stuck at 20mb/s with incredible high await/iowait times:

[root at nas1 queue]# iostat -x -m 1
Linux 2.6.24-rc2 (nas1)         11/07/2007

avg-cpu:  %user   %nice %system %iowait   %idle
           0.91    0.00   15.31   80.57    3.21

Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rMB/s    wMB/s
avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0  17.29 159.88  3.60 439.73  196.30 37779.44     0.10    18.45
85.66   149.82  333.80   2.22  98.44

avg-cpu:  %user   %nice %system %iowait   %idle
           0.00    0.00    4.00   96.00    0.00

Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rMB/s    wMB/s
avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0   0.00  88.00  0.00 214.00    0.00 40896.00     0.00    19.97
191.10   513.17 4736.82   4.67 100.00

avg-cpu:  %user   %nice %system %iowait   %idle
           0.00    0.00    0.00  100.00    0.00

Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rMB/s    wMB/s
avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0   0.00   0.00  0.00 107.00    0.00 32384.00     0.00    15.81
302.65   329.61 5116.19   9.35 100.00


I'm sure it isn't a raid issue because readin&writin directly to the
filesystem i have 300+ mb sustained with very low iowait/await/svctime
values.
Additionaly, changin processor back to old P4 solves the problem... no
iowait, syncin drbd up to 200 mb/sec

Anyone out there usin drbd with dual/quad core processors?
Any help will be very very appreciated...
--
so long and thank for all the fish
--matteo

> On Wed, Nov 07, 2007 at 10:10:52AM +0100, Matteo wrote:
>> HI all folks,
>>
>> anyone tried 8.2.1 with kernel 2.6.24-rc1?
>> i got a kernel oops while starting drbd:
>
> we are tracking upstream, there are some changes necessary.
> there will be a suitable drbd release soon after 2.6.24 is out.
>
> though, for now, you just have to "stay tuned". sorry.
>
> --
> : Lars Ellenberg                           http://www.linbit.com : :
> DRBD/HA support and consulting             sales at linbit.com : :
> LINBIT Information Technologies GmbH      Tel +43-1-8178292-0  : :
> Vivenotgasse 48, A-1120 Vienna/Europe     Fax +43-1-8178292-82 : __
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